BET Method surface area analysis has determined the effective surface area of OF 3DM Pro-Filter Medium to be in the range of 2550mē / litre, far surpassing other biological mediums in the market.

As taken from their site,
Way more than reputable brands such as Seachem. Mailed QianHu to provide independent source analysis but haha no reply.From what I know they're good at copying and their products have a good price only...not exactly quality.

  • Seachem matrix is highly porous - enormous surface area (>~700 m2/L)
  • Anyone got thoughts on this compared to other filter media?